api: add duration to meeting fillslot result (#27900)

chrono/api/views.py

@@ -467,6 +467,7 @@ class Fillslots(APIView):
                     reverse('api-accept-booking', kwargs={'booking_pk': primary_booking.id}))
         if agenda.kind == 'meetings':
             response['end_datetime'] = localtime(events[-1].end_datetime)
+            response['duration'] = (events[-1].end_datetime - events[-1].start_datetime).seconds // 60
         if available_desk:
             response['desk'] = {
                 'label': available_desk.label,

tests/test_api.py

@@ -554,6 +554,7 @@ def test_booking_api_meeting(app, meetings_agenda, user):
             ).isoformat()[:16]
     assert resp_booking.json['end_datetime'][:16] == localtime(Booking.objects.all()[0].event.end_datetime
             ).isoformat()[:16]
+    assert resp_booking.json['duration'] == 30
 
     resp2 = app.get('/api/agenda/meetings/%s/datetimes/' % meeting_type.id)
     assert len(resp.json['data']) == len([x for x in resp2.json['data'] if not x.get('disabled')]) + 1